Wiki info about Spitfire Mk Vb/trop

A single-seat, single-engine all-metal monoplane fighter. After the Mk II and two more experimental variants of the Spitfire, the next major variant to see mass production was the Spitfire Mk V. Central to this new Spitfire was its engine – the 1470 HP Rolls Royce Merlin 45. This was equipped with a single stage supercharger and, coupled with a new carburettor design, allowed the Mk V to perform zero G manoeuvres without starving the fuel flow to the engine; a problem which had plagued earlier models of the Spitfire. The engine change necessitated strengthening the engine housing and installing a more effective oil radiator with a circular rather than U-shaped housing, and fitting two strengthening longerons to the upper surfaces of each wing.
The Mk V initially followed a similar pattern to the Mk I and Mk II in that it was fitted either with the Type A or Type B wing, again carrying eight machine guns or two cannon and four machine guns respectively. Less than 100 of the Mk VA were produced; it would be the Mk VB with its formidable 20mm cannon and four machine guns which would be the major production model, with 3911 VBs manufactured.
Some of the fighters were made for tropical climate conditions: a Vokes filter was installed over the carburettor air intake, under the engine. It was covered by special “lips” which helped prevent excessive dust intake, but at the cost of top speed and rate of climb. This variant was named the Spitfire Mk VB/Trop and was used in the Mediterranean theatre of operations, especially North Africa and Malta.
The first Mk Vs entered combat in February of 1941. The improved power and performance characteristics of the Spitfire Mk V made it a competitive match for the new German Messerschmitt Bf109F, but it was found to be inferior to the new Focke-Wulf FW190. As a result, the Spitfire Mk V was the first variant to experiment with the option of clipped wing tips, which increased the aircraft’s roll rate and top speed at low level, but sacrificed its rate of climb.
The Mk V formed the backbone of RAF Fighter Command across several theatres of operations, and was considered by some pilots to be the definitive model of the Spitfire.